{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2957d5ac45872b185f2730490a3a5623f05b6c6dac6b522d20b34cf489e14d8d",
    "signature": "0xb4a9c16b6abf9c5b0616a63e268baeb612e5dce8d7b6c6eec8cb4c31052b06ba345a1d69c8708d6931e0527dce115c17aa38a9a433e09186c9b1aa1f4a1ef4a01c",
    "signer": "0x028de6b731736399C80a17151f6E33682D3ACE28",
    "userId": "13214151"
  }
}